Electrical regulator.



A. A. TIRRILL.

ELECTRICAL REGULATOR.

APPLICATION FILED JUNE 19, l9l5.

1,275,796. Patented Au a'lsls.

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WITNESSES INVENTOR ATTORNEY UNITED STATES PATENT OFFICE.

ALLEiq' .L TmnILL, or rirhsnunen, rmmsrnvnma, nssienon T0 wnsrmeiiousn IELECTRIC AND MANUFIACTUBING comrm, n conrona'rron or PENNSYLVANIA.

ELECTRICAL REGULATOR.

7 Specification of Letters Patent.

Patented Aug. 13, 1918.

Original application filed October 5, 1911, Serial No. 653,010. Dividedand this application filed June 19,

' 1915. Serial 110,135,118. a x

To all whom it may concern:

Be it known that I, ALLEN A. TIRRILL, a citizen of the United States,and a resident of Pittsburgh, in the county of Allegheny and State ofPennsylvania, have invented a new and useful Improvement in ElectricalRegulators, of which the following is a speci-.

fication, this application being a division of application Serial No.653,010, filed October 5, 1911.

My invention relates to electrical regulators, and it has for its objectto provide a simple and exceptionally efi'ective regulator of the kindin which the regulation is effected by adjustment of the fieldexcitation of a dynamo-electric machine.

Figure l of the accompanying drawing is a diagrammatic view of a systemof distribution embodying my invention, and Figs. 2 and 3 representmodified forms of the main control element of the regulator.

A system in connection with which the present invention may beconveniently em-- ployed comprises a main generator having an armature 1that is connected to a suitable distributing circuit 234 and afieldmagnet winding 5 that is supplied with exciting current from an emitter6. The exciter is provided with afield magnet winding 7 that ispreferably shunt excited though it may be supplied with current from anyother suitable source, and in series with the said field magnet windingis a resistor 8 that is adapted to be shunted by means of cooperatingstationary and movable contact terminals 9 and 10 of a relay 11constituting a part of'the regulator. I

The regulator comprises, further a stationary contact terminal 12 thatis resiliently mounted, as by being supported upon the end of a platespring 13, and a cotiperating movable contact terminal 14: that ismounted upon one end of a lever 15. The lever 15 is pivotally supportedby a lever 16, havinga stationary fulcrum'a't 16 and is actuated by anelectromagnet winding 17 that is energized from the circuit 234;, as,for instance, by being connected through a transformer. 18 to theconductors 2 and 3. When thus connected, it is energized in proportionto the voltage of the distributing circuit. The winding 17 is providedwith a core 19 that is pivotally connected to the lever 15 and ispartially counter-balanced by trical condition otthe distributingcircuit,

which, as illustrated in Fig. 1, is its voltage.-

The lever 16 is-actuated, so as to move the contact terminal 14: intoand out of engagement with the stationary contact terminal 12, by meansof an electromagnet winding 24 having a core 25, the said core beingdrawn downwardly in opposition to the tension of a spring 26 when thewinding 24 is sufficiently energized. The movements of the core 25 arepreferably retarded, as, for

instance, by means of a dash pct 28. The

Winding 24c-also receives energy from the distributing circuit 23-4, anda lamp 33, or any other suitable resistor, is connected in seriestherewith, the said resistor being adapted to be shunted by means ofcotiperating stationary and movable contact terininals 34 and 3-5 of arelay 36. The relays 11 and 36 are provided with parallel-connectedactuating windings 37 and 38, re

spectively, that receive energy from the exciter or any other suitablesource, and the circuits of which are governed by the contact terminals12 and 1 1. I

It will be observed that the construction of the apparatus is such thatthe contact terminal 14 may be actuated independently by the windings 17and 24, the winding 17, as before stated, serving to vary the distanceof the contact terminal 14 from the terminal 12 in response tovariations of an electrical condition of the distributing circuit, andthe winding 24 serving to move the contact terminal ltinto and out ofengagement with the terminal 12 in accordance with variations of thedegree of its energization, which variations are caused by theengagement and will be best understood from a detailed con--v siderationthereof. When,.as illustrated, the contact terminal 14. isout ofengagement with the terminal 12, therelay magnet Windings 37 and 38 arenot energized and, consequently, the contact terminals 9 and 34 do notengage the terminalslO and 35. The shuntcircuit to the resistor 8 isthen interrupted and'the field excitation and voltage of the exciter arediminished, followed by a diminution of the 'field excitation andvoltage of the main generator. By reason of the reduction of the voltageof the generator, the winding 17 is energized to a less degree and thecontact terminal 14 is accordinglyslightly lowered. When the contactterminals 34 and 35 are not in engagement, the resistor 33 is includedin the circuit of the magnet winding 24, with the result that it is lessstrongly energized, and the spring 26 contact terminal 14 is slightlyraised. Upon engagement of the contact terminals 34 and 35, the resistor33 is shunted and the magnet Winding 24 becomes more strongly energized,with the result that the contact terminal 14 is moved out of engagementwith the terminal 12.

The regulator continues to operate in this manner,'the periods ofengagement and disengagement of the contact terminals 12 and 14 varyingwith the position of the contact terminal 14 as determined by thevoltage or any other selected electrical condition of the distributingcircuit, and in such manner that the said electrical condition will bepermitted to vary only slightly from a uniform or required value andwill be quickly brought to a condition of stability. By-

reason of the fact that the winding 24 receives energy from the maincircuit, rather than from the exciter circuit, and that its circuit isgoverned by the relay 36, the regulator very quickly and effectivelyrestores the voltage or other electrical condition to its normal value.The operation of the regulator is entirely independent'of theexregulators.

citer voltage and of the consequent delays resulting from theretardation due to the inductance of the exciter field circuit, and theregulator is also unaffected in its operation by commutation troubles ofthe exciton It also does not require adjustment for different excitervoltages.

In Fig. 2, the movable contact terminal 40 that is carried by the lever41 is located tothe left of the pivotal connection between the levers,rather than to the right as in Fig. 1. The position of the movablecontact terminal, with respect to the pivotal connection between thelevers, may be varied according to the desired or requisite conditionsof regulation.

A further modified form of the regulator is shown in Fig. 3 in which thelever 43 that is actuated or vibrated by the coil 24 is straight andhorizontal an has its fulcrum at one end and the core of the coil 24susended from its other end. A contact carryng lever 44 is pivotallyconnected to the lever 43 at an intermediate point thereof.

The connections and operation of this regulator are the same as those ofthe preceding 1 claim as my invention I I 1. An electrical regulatorcomprising a pa1r of cooperating stationary and movable contactterminals, a substantially straight and horizontal lever carrying themovable contact terminal, another substantially straight and horizontallever having a stationary fulcrum, the contact-carrying lever beingfulcrumed upon and entirely supported thereby, and electromagnetic meansfor separately actuating each of said levers.

2. An electrical regulator comprising a pair of cooperating stationaryand movable contact terminals, a substantially straight and horizontallever carrying the movable contact terminal, another substantiallystraight and horizontal lever having a stationary fulcrum at one end,the contact-carrying lever being fulcrumed'upon and entirely supportedthereby, and electromagnetic means for separately actuating each of saidlevers.

In testimony whereof, I have hereunto subscribed my name-this 18th dayof June,

ALLEN A. TIRRILL.

